GUI: Create basic React app with NEAR layout and deploy to GH Pages

[zahhar]

NEAR layout to follow: https://explorer.near.org/ Deployment pipeline to GH pages - using Parcel, Yarn (see Corgis FE stack) Using JS API 0.40 - https://github.com/near/near-api-js/

Main area:

• Title "NEAR NFT Checker"
• 2 text inputs - "NFT Contract Address" (mandatory) and "Token ID" (optional)
• "Check it" button.

[sxurik]

Finished in #11 and #12. The current version of the checker is available on https://epam.github.io/near-nftchecker/